Here's a few shots of the frame:
I tried to go sturdy but not too heavy. The steel is 2" tube, 1/8" thick. I saw a great way of mounting the jacks on one of your frames, and copied it for the back corners (thanks). The tabs on the inside of the frame (tough to see in the photos) are for bolting the floor on to the frame. I hope to be able to remove the body once every year or two to inspect the frame and touch up the paint. Axle is a Dexter torsion, with 14" wheels.
Here's the start of the wall framing. The profile is the ultralight profile, with a slightly different door shape. Behind the wall is the floor, showing the top. The holes are for the bolts to attach to the frame. The underside is covered with black goo. Inside width is designed to be 54", with a sleeping length long enough for a full size mattress.
I've spent countless hours surfing this forum. Thank you all for your knowledge and great ideas. I'll post more pics as I build.
Justin